private static void RenderEmptySection(object value, BindingContext context, Action<TextWriter, object> template)
{
if(IsFalseyOrEmpty(value) == false)
{
throw new HandlebarsRuntimeException("Tried to render a truthy or non-empty object in an inverted section");
}
template(context.TextWriter, null);
}
private static void InvokePartial(
string partialName,
BindingContext context,
HandlebarsConfiguration configuration)
{
if(configuration.RegisteredTemplates.ContainsKey(partialName) == false)
{
throw new HandlebarsRuntimeException("Referenced partial name could not be resolved");
}
configuration.RegisteredTemplates[partialName](context.TextWriter, context);
}
private static void RenderSection(object value, BindingContext context, Action<TextWriter, object> template)
{
if(IsFalseyOrEmpty(value))
{
throw new HandlebarsRuntimeException("Tried to render a falsey or empty object in a section");
}
if(value is IEnumerable)
{
foreach(var item in ((IEnumerable)value))
{
template(context.TextWriter, item);
}
}
else if(value != null)
{
template(context.TextWriter, value);
}
else
{
throw new HandlebarsRuntimeException("Could not render value for the section");
}
}
public BindingContext(object value, TextWriter writer, BindingContext parent)
{
_value = value;
_writer = writer;
_parent = parent;
}
public BindingContext(object value, TextWriter writer, BindingContext parent)
{
_value = value;
_writer = writer;
_parent = parent;
}
public ObjectEnumeratorBindingContext(BindingContext context)
: base(context.Value, context.TextWriter, context.ParentContext)
{
}
//TODO: make path resolution logic smarter
private object ResolvePath(BindingContext context, string path)
{
if (_resolutionCache.ContainsKey(context) && _resolutionCache[context].ContainsKey(path))
{
return _resolutionCache[context][path];
}
var instance = context.Value;
foreach(var segment in path.Split ('/'))
{
if(segment == "..")
{
context = context.ParentContext;
if(context == null)
{
throw new HandlebarsCompilerException("Path expression tried to reference parent of root");
}
}
else if(segment == "this")
{
continue;
}
else if (segment.StartsWith("@"))
{
var contextValue = context.GetContextVariable(segment.Substring(1));
if (contextValue == null)
{
throw new HandlebarsRuntimeException("Couldn't bind to context variable");
}
instance = contextValue;
break;
}
else
{
foreach (var memberName in segment.Split('.'))
{
try
{
instance = AccessMember(instance, memberName);
}
catch (Exception)
{
instance = new UndefinedBindingResult();
break;
}
}
}
}
if (_resolutionCache.ContainsKey(context) == false)
{
_resolutionCache.Add(context, new Dictionary<string, object>());
}
_resolutionCache[context].Add(path, instance);
return instance;
}
public ObjectEnumeratorBindingContext(BindingContext context)
: base(context.Value, context.TextWriter, context.ParentContext)
{
}